Im going to jump in on this gang style beating of the topic at hand. My 4Runner is coming up on 120k/mi and my GF's Subaru Legacy (AWD) is coming up on 60k. I don't want to make this a "what brand thread" as we already have one. I would like to buy two types of fluid for our 4 differentials combined. The FOM specs are as follow:

Scuby~
Both Diffs: GL-5 80W-90 Non-Hypoid GO

Runna~
Xer Case: GL-5 75W-90 Non-Hypoid GO
Front D: GL-5 75W-90 Hypoid
Rear D: GL-5 90 Hypoid

Do I buy 80W-90 NHGO for the Subaru and my transfer case and 80W-90 Hypoid for my diffs to make it an economical/efficient purchase each time. I plan on buying enough to do at least two services depending on the outcome of the viscosity combo. Maybe the answer to doing both of my diffs is on another thread, I searched and just don't get it :pat:

FWIW, I dont see temperatures below 15 degrees EVER. Thats too cold for me.

BTW, I have decided on all Redline oils so if they have a specific product that changes things, lemme know.

Thanks people.